Surface working machine



0. HAUSER SURFACE WORKING MACHINE 2 SheetSQ-S he'et 2 Filed Aug. 14, 1946 INVENTOR Patented Dec. 19, 1950 Application-Augusta I4, 1946;;SeriaI N 0. 6905569 In Switzerland August 17,- 1945- I chin. '(Cl. 51-1176) The present invention relates to a sort-ace working machine and, particularly, toa. floorsuriaoing machine. oi the rotary type employable V for cleaning, waxing, polishing and grinding floor surfaces-r It is an object of the invention to providemeans for mounting in a portable housingandiin a; very compact manner a horizontal cylindrical drum for rotation and for detachably connecting to said variousworhi-ng or cleaningdevices or tools.

Another object of the: invention is to provide means facilitating accommodation: of an electric motor within said horizontal drum for driving the same.

A further object of theinvention is toprovide means making it possible to associate a dust catcher or collector device with said housing,- which may be equipped: with a suction device adapted to be" actuated by said electric motor;

=Stil'1'a further object of the hwentionis theprovision of aframe: with front andrea-r wheels carrying said. housing: and saicldrum in adjusted position: for varying; the pressure imparted by the I by which the friction gears and: the electric motor are: covered up in the drum and to which:

working tools to the floo'nsurfa'ce- With the foregoing. and: other objects" in View; 2

the invention will he more fully described here-- i'na-iter; [in embodiment of this invention:- is shown in the accompanying drawings-inwhich:

1 is a sfde elevation of the machine according to the invention with the side wall of the housing removed therefrom and the upper portion of the operating handle broken away.

Fig. 2 shows a longitudinal vertical section taken on the line 2-2 in Fig. 1..

fig. 3 is an end View of the drum and the driving gear adapted to rotate the same, the

drum being equippedwith acleaning device of steel shavings. Figs. 4 tofi-varei-rag-mentai y side views:otsvai'- time working devices; drawn to"a1larger scale.

Fig. 7'- is avertical sectional view of a; dust suction device.

' Fig. 8 is -a' horizontal section'at'view of the sucti'ondeviceef- Fig. 7-, and Fig. 9 showsa-crosssectionthrough: the dust suction compartment.

- In the-construction-shown in'the drawing-s an I electric motor representedby 'its-motopfram is arranged within a hollow horizontal cylindrical working drum '3 and has a shaft 2 which substantially coincides with the drum axis. Shaft 2 carries at both ends a bevelled friction wheel 3, preferably provided with a rubber surface. Each friction wheel 3 drives three similar but inversely 2. bevelled friction wheels 5' which are arranged on both end. walls-respectively, of the motor frame i and rotatably mounted on codi'recti onal pins screwed into the aforesaid end walls of'the'mo'tor frame. Each-set of friction wheels 5 acts upona? respectivebevelled rubber ring 6 said rings 6 being secured-to the inner surface of 'the working. drum- '5' near the respective lateral edges 1 thereof. The cylindrical. dru-n T is adapted to removing receive various working tools or devices 8 which belong tothe machine and may be interchange ably mounted thereon. There are devices inthe form of. steel shavihgsofsteelwi-re brushes; fibre brushes hair brushes, and the like, theworiiing; surfaces thereof being: interrupted at regular intervals as shown in Fig. 3 Each working device is equi-pped with aclamping means i-ilillustrated 1- 4: and'-5,.by means oiwhichthe working tool may bereadily: attached to and retained on the outercylindrical drum surface? This drum surface may be covered by a grinding cloth which is pasted-thereonas shown inFi'gQfi'. The two heads or ends of the drum T are forrned: two stationary supporting dish-shaped plates H the frame I of the electric motor is scour-edict;

means of screws l2-.- A- grooved pulley Q adja" cent the outer; face oi disk l-i (shown in Figs l and'2) is connected-for rotation through an-aper ture in this diskwith one of the hevelled ir-ic ti'on' wheels: it. Bi-fierent-fiat iron-ira ne hers ['3 l9: which are secured tothe disks it carry and: connectthe tothe' housing: 36 whichis made of sheet'metal and which includes: a dust collector compartment 34-.- The four rollers on wheels 21' are eachsupported in aforh 'i he fGlk-Of thetwo fore rollers'is connected to a fiat iron: bar It screwed atltwtothe-dish i i and are adjustable in two positions-- determined? by separate" threaded openingsfiia adapted forthe en: gagenientofthe screw 25 cam ied: by the bar 41 Estop 24 on thedish M limits the swinginganiove ment of the bar; 'Fheforlcof the two rear rollers is'conne'cted at we by means of a; linkage which oonsists of fiat iron-bani! 5 andarrn 2 Etato an adins-ting lever. 1 5- which is pivotally mountea at i529 on the bar 13-; Lever l-5-is operable to'swing about pivot 15h for the" engagement -of a 'cletent l to with one of the spaced grooves:When-curvedarm It. Lever l5 and the aforesaid linkage form part of the height-regulating means for spacing the drum surface from a floor F to be worked upon. A hollow axle 28 screwed into each disk I 1 projects therefrom in axial alinement with the threaded hole 25a.

drum axis. The surface working machine has an operating handle of which only the fork H is shown in the drawings. This fork I1 is pivotally mounted with its two perforated ends on the two hollow axles 28. The rollers 2| together with the two disks H and the intermediate fixing bars constitute the frame or under carriage on which the motor driven working drum and the housing are mounted.

The dust collector compartment 34 includes a suction or ventilator device comprising two horizontal suction tubes 23 symmetrically arranged in axial alinement, which have a radial inlet and an axial outlet opening as shown in Figs. 7 to 9. Two fans 29 are disposed in the outlet openings and mounted on a common shaft driven by a grooved pulley l8 which extends outside the tubes 23 and is coupled for rotation with the pulley 9 by means of a transmission belt 22 running in the grooves of the pulleys. A metal sheet 30 (Fig. 8) is fixed to the dust collector compartment 34 to divide the dust stream and lead it to the inlet openings of the suction tubes 23. The dust sucked by the fans 29 falls down into a container 21 which forms the lower part of the dust-collector compartment 34 and is detachably hinged thereto. The container 21 is equipped with a handle 38. A partition 32 extending downward in the upper part of the dust collector compartment 34 is provided to guide the dust into the container 21, while the flow of air is deflected and passes upwards through a first filter 33 into a chamber behind the partition 32 and then through a second filter 3| on the wall of the dust-collector 34 to the outside atmosphere (Fig. 9).

Fig. 1 shows the machine drum equipped with a scrubbing device or tool comprising batches of steel shavings. In order to use the machine for surface grinding, the scrubbing equipment is removed from the drum surface to uncover the grinding cloth surface of the same and the supporting bars M of the forerollers or wheels are then swung about pivot Ila from the lower stop 24a to abut against the upper one 24 while the screw 25 engages the corresponding upper The friction generated by the respective rotating working tool on the fioor surface F may be varied by lifting or lowering the drum 1 by means of the adjusting lever means [5 arranged on both sides of the machine and having their free ends coupled by a cross handle bar (not shown). The motor cable 35 extends along the operating handleand fork i! where it is fixed by means of clips 31 and leads through one of the hollow axles 28 to the frame I of the electric motor. When the machine is operated, the electric motor drives the working drum I through the friction gears 3-5 and simultaneously the ventilators 29 through the transmission pulleys 9 and I8. The housing 36 covers all motor driven parts of the machine and preferably consists of detachable parts which may be removed separately.

There may be no suction device in the dust catcher and the opening to the dust catcher may be so constructed that the dust is centrifuged into the dust catcher owing to the rotation of the working drum, while the revolved air flows through filters to the outside.

It can thus be seen, that there has been provided according to the invention a surfacing machine adapted for the use of a plurality of interchangeable tools on the surface of the drum of the machine. This drum is rotatable and hollow and accommodated in a casing which is equipped with front wheels and rear wheels; an electric motor positioned in said hollow drum and adapted to impart rotary movement to the latter, suction means in driving connection with said motor and disposed at a location above the axis of said drum within said casing, heightregulating means spacing said drum surface from said floor to be worked upon, said heightregulating means including hand-operated adjusting lever means pivotally mounted on the casing and a linkage connecting the adjusting lever means to the rear wheels, said linkage being pivoted to the casing above said rear wheels, whereby upon operation of said adjusting lever means said linkage swings said rear wheels to thereby regulate the distance of the axis of said drum with respect to the floor surface, and means connected to said front wheels for changing the relative position of the axis of the latter to that of said rear wheels.

I claim:

In a floor surface working machine having a rotatable and hollow drum accommodated in a casing which is equipped with front wheels and rear wheels; an electric motor positioned in said hollow drum and adapted to impart rotary movement to the latter, suction means in driving connection with said motor and disposed at a location above the axis of said drum within said casing, height-regulating means spacing said drum surface from said floor to be worked upon, said height-regulating means including hand-operated adjusting lever means pivotally mounted on the casing and a linkage connecting the adjusting lever means to the rear wheels, said linkage being pivoted to the casing above said rear wheels, whereby upon operation of said adjusting lever means said linkage swings said rear wheels to thereby regulate the distance of the axis of said drum with respect to the floor surface, and means connected to said front wheels for changing the relative position of the axis of the latter to that of said rear wheels.

CARL HAUSER.

REFERENCES CITED The following references are of record in the file of this patent:

Harris May 1, 1945 

